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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a82e4e72cb657a96234bba753727c0b80d9636a37571ad7ef1a2fe1c7a162fef' 
  AND token = '+LeHuW8GGn/7ZjJjsiLcFTwSNeDCmnlJb0ts8+PQUis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}